:root {
    --primary-color: #007bff;
    --secondary-color: #6c757d;
    --background-color: #f8f9fa;
    --text-color: #333;
    --ball-color: #fff;
    --ball-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.dark-theme {
    --primary-color: #00aeff;
    --secondary-color: #adb5bd;
    --background-color: #212529;
    --text-color: #f8f9fa;
    --ball-color: #343a40;
    --ball-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
}


body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: var(--background-color);
    color: var(--text-color);
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%239C92AC' fill-opacity='0.09'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.theme-switcher {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

#theme-toggle-btn {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    color: #fff;
    background-color: var(--primary-color);
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

#theme-toggle-btn:hover {
    opacity: 0.8;
}

.container {
    text-align: center;
    background-color: var(--ball-color);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1), 0 6px 6px rgba(0,0,0,0.1);
}

h1 {
    margin-bottom: 2rem;
    font-size: 2.5rem;
    color: var(--primary-color);
}

.menu-recommender {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.menu-display {
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    min-height: 100px;
    margin-bottom: 2rem;
}

#recommend-btn {
    padding: 1rem 2rem;
    font-size: 1.2rem;
    font-weight: bold;
    color: #fff;
    background-color: var(--primary-color);
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 123, 255, 0.3);
}

#recommend-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 12px rgba(0, 123, 255, 0.4);
}

.menu-item {
    opacity: 0;
    animation: fadeIn 0.5s ease-in-out forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
    }
}